Skiving-machine



1. ROBINSON. SKIVING MACHINE.

APPLICATION FILED DEC- IO- I919.

Patented Aug. 30, 1921.

2 SHEETS-SHEET I.

J. ROBINSON.

' SKIVING MACHINE.

APPLICATION HLEDDEC. so. 1919.

Patented Aug. 30, 1921.

2 SHEETS-SHEET 2.

UNITED, STATES PATENT oFFIcE.

JOHN ROBINSON, or KINGSWOOID, NEAn BRISTOL, ENGLAND, ASSIGNOR' or oNairAtr I 'rononen'zmceuns & COMPANY, LIMITED, or BRISTOL, ENGLAND.

To aZZ whom it may concern. 1

Be it known that I,. JOHN Rois-I soN, of Park Road, "Kingswood, fnear' Br1stol, 1n the count of Gloucester,,England,a SLIlHBCt of the Klng of Great Britain and Ireland, have invented certain new. and useful Improvements Skiving-Machines, of fwhich' the following is a specification. u

This invention relates to machines of the cylindrical cutter type for skiving leather in the manufacture of boots and shoes.

This invention has for. its object to provide improvements in means for advancing the cylindrical knife as it wears away by use.

According to this invention a sklving machine is provided'with means for advancing the cylindrical knife" forward to the feed rollers as the knife wears tLIIdTOIfTaCIlItating detachment} and withdrawal of the knife for substitution j by anotherysaid means comprising a screw-threaded spindle passed through 'a collar adapted to "be clamped upon a sleeve slidable with the knlfB-Cll'lV-,

ing shaft, andanadjusting nut workingon the screwrthre'aded part of the spindle, the said nut being held from axial movement. 7

Referring to the accompany ng draw- Tigure 1 represents a part side elevation and part longitudinal section 10f my 1mproved skiving mach ne,

Fig. 2 is an end VIGW- partly sectional. I From both figures are omitted certain usual parts not necessary to be shown, which said parts are arrangedas 0rd1na r1ly.-

The cylindrical knife 1, which is of the usual kind, is screwed to the flanged driving shaft 2 on which is mounted a concentrio sleeve 3 whichis embraced by a collar 4: which .is normally tight on the sleeve,

being held so by a screw 4. The sleeve 3, which at the forward end butts against the flange5 of the driving shaft 2, is supported by and is slidable in lugs 2 cast with the,

machine frame. Supported alsoin'the lugs 2 is a feeding spindle 6 which for a part of its length near the end, is screw-threaded. A grub screw 4? holds the collar 4 on the spindle 6. Thespindle carries a nut 7 which is restrained from axial movement along the spindle by the sides of an aperture 8 in the frame of the machine through which aperture the nut 7 projects. By turning the nut 7 the spindle 6 is advanced or retired accordingto direction in which the nut 7 SKIVING-MACHINE.

Specification of Letters Patent. P t nt u 92 7 Application filed December 10,1919. Serial No, 343,892. f

is turned. It followsithat the sleeve 3, when the collar 4: is tight thereon, travels with the spindle 6. As the knif 1 wears',it is fed forward by means of the nut7- When it, is required to detach and remove the knife 1, the collar 4 is loosened by slackening the sc1"ew}4c :The sleeve '3 is then retired'to the right to the fullextent of its travel. The worn knife 1 is then unscrewed from the flange5- of the driving shaft 2v and taken out. i A fresh fknife having been screwed to the flangeb, the nut 7 is operated to bring the collar 4 to starting point. The collar; is then re-clamped on the sleeve 3. 4 l A .7 The lower feed roller 9, which is of the usual serrated kind, rotates about; the

spindle 10, which is, -a's' ordinarilyi, carried in the rectangular continuation of the spindle 11 by which; the roller is tilted axially for skiving to various degrees of inclination. Held tightly to the Spindle 11 by the-screw 12 is a lever 13 throughthe lower part of which is screwed an adjusting screw 14 which bears against a lump 15 cast with the "frame 16 of the machine. A coiled spring 17, which is attached'at one end to a hook l8 and, at the other end,"is connected to a pin 19 fixed in the lever 13, keeps the wheel 9 up to its work. The wheel 9 is ad.- justed to work at varying degrees of axial inclination according to adjustment by the arm of which carries the spindle 11. The

lever .20 carries an adjusting screw 24 the point of which. bears against the frame 16 of the machine. A coiled spring 25 keeps the feed wheel 9 up to its work as adjusted. The levers 13 and 20 act in concert.

The upper feed roller 26, which is 'of the usual kind, is fixed, on and rotates with the spindle27 which is driven through the medium of the shaft 28 having ball and socket joints at each end. At the outer end the j shaft 28 is connected with a train'ofbevel g of usual kind which is driven off a main driving shaft. The spindle 27 is supported at its outer part in one arm of a bracket 29 which is pivotal on the pin 30 fixed in the slide 31. The other arm of the bracket 29 engages the forkedbottom of the slide 31. -The spindle 27 is rotatable in a block 32 which is integral with the bracket 29. The said bracket is forked at its upper end and contains in the fork a cylindrical nut 33 which can turn through a short range. Adapted to turnin the nut 33, as a'nut and in the slide 31, is an adjusting screw 34 which extends into a sleeve 35 and is held thereon by a screw 36 which takes intoan annular groove provided in the ad justing screw 34. Thus, in adjusting the degree of inclination of the roller 26, as required to'meet the angle of skive, the adjusting screw Sworks at all times without liability to become jammed. Screwed into the upper part 37 of the slide 31 is a screw 38 by means of which the slide 31 is raised and lowered to accommodate different thicknesses of leather to be fed between the rollers. I

'VVhat I claim and desire to secure by Letters Patent is z- 1. In askiving machine, aframe, avshaft on said "frame, a cylindrical cutter on said shaft, means for moving the'shaft axially, a barrel-shaped feed roller adapted to conform with the segment of the cutter, its axis being substantially in line with the edge of and spur gearin the cutter, said means for moving the shaft 7 axially comprising a sleeve,fa screwed spindle disposed longitudinally of and slidably mounted on said frame, and a collar clamped: to said sleeveand connected to said screwed spindle. H a. V

2. In a skiving machine, a frame, a pair of feed rollers mounted on spindles disposed transversely of said frame, a sleeve and a screwed spindle disposed longitudinally of and slidably mounted on said frame, acollar clamped to said sleeve and connected to i said screwed spindle, a shaft mounted in said sleeve, a flange on said shaft, a cylindrical knife mounted on said flange, said sleeve being adapted tobe pressed to bear on said flange, and means for moving the screwed spindle longitudinally of the said frame to move the saidshaft forward to the feed rollers as the knife wears and to facilitate the detachment-and withdrawal of the knife for substitution of another; V 3. In askiving machine, a frame, a pair of feed rollers mounted on spindles disposed transverselyofsaid frame, a sleeve and threaded spindle disposed longitudinally of and slidably mounted on said frame, a collar clamped to said sleeve and connected to name to specification.

JOHN: ROBINSON.

y whereof i have signed my 

